<template>
  <div>
      <!--  面包屑导航-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>

     <!--  卡片区域-->
     <el-card>
       <el-row>
         <el-col>
           <!-- 2 为ECharts准备一个具备大小（宽高）的Dom -->
    <div id="main" style="width: 750px;height:400px;"></div>
         </el-col>
       </el-row>
     </el-card>
  </div>
</template>

<script>
// 1 导入echarts
import echarts from 'echarts'
import _ from 'lodash'

export default {
  data () {
    return {
      // 4.2 需要合并的数据
      options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: 'value'
          }
        ]
      }
    }
  },
  // dom创建完成后执行钩子  dom被渲染完毕
  async mounted () {
    // 3 基于准备好的dom，初始化echarts实例
    var myChart = echarts.init(document.getElementById('main'))

    // 4.1 获取数据
    const { data: res } = await this.$http.get('reports/type/1')
    if (res.meta.status !== 200) {
      this.$message.error('获取折线图数据失败')
    }
    // 4 指定图表的配置项和数据  --- 准备数据和配置项
    /* var option = {
      title: {
        text: '用户来源'
      },
      tooltip: {},
      legend: {
        data: ['销量']
      },
      xAxis: {
        data: ['衬衫', '羊毛衫', '雪纺衫', '裤子', '高跟鞋', '袜子']
      },
      yAxis: {},
      series: [{
        name: '销量',
        type: 'bar',
        data: [5, 20, 36, 10, 10, 20]
      }]
    } */
    // 4 准备数据和配置项 --- merge 合并两个对象
    const result = _.merge(res.data, this.options)

    // 5 使用刚指定的配置项和数据显示图表  ---  展示数据
    myChart.setOption(result)
  },
  methods: { }
}
</script>

<style lang="scss" scoped>

</style>
